Virtual Reality Technology, Virtual Design Environment

The virtrual reality technology is a developing producetion which is synthesized from Computer Grapics , Artificial Intelligence, Computer Network and Communication Management. In the machine industry there is an extensive application perspective with the Virtrual Reality technology. The Design for Assembly is a hot-point in the currently research.With the cut-in point of the research and development in a virtual design system, this paper researches and aanalyses its interrelated virtrual reality technology, which is in both the theoretics and the practise.The stereo display equipment owns an important position in the virtual reality system and offers the third dimension for the system. But the purshase cost is expensive. This offered the two-computeres -communications-based stereo display technology ,which replaces the complexity of hardware with the complexity of software in order to debase the cost and which is a new development of the stereo display technology.The virtual_real_based mixed modeling technology is a graphics__ image_based mixed modeling technology. The technology can makes the image as a foreground in the virtual environment. In the alternation its key antarithmetic are the virtual environment alternation antarithmetic and the virtual real jumping antarithmetic.There are questions, which people hard alternate with the object in the image and in the alternation the amalgation with the graphics and image is difficult, in the image_based modeling. The virtual environment alternation antarithmetic manages the objects in the virtual environment as the image form, and uses the ID mark to manage the objects and realize the alternation. The the virtual real jumping antarithmetic manages the jumping objects with both the virtual environment disposal and the real environment disposal at the same time, and uses the projection with the outside face to realize the amalgamation with the graphics and image one another, which achieves the effect of the no slot connection of the virtual and the real.There is a question in the assembly layout, which no considers the phase nature , the process nature and the parallelizability of the assembly. The VRML-based virtual assembly process simulation uses the secondlayout, the action simulation and the management process.And so it achieves the effect of reflecting the assembly program realer and clearer. The second layout uses the positon information and parallelizability of the parts and the assembly parts to mark out the assembly again, to realize the process nature and the parallelizability of the assembly. Using the way of kinermatics and the principle of connection realizes the action simulation and the management process. It realizes the showing information in the management process, and controls the phase nature and the process nature of the assembly realization.